CN115287622A - 一种分子膜碳纸及其制备方法和应用 - Google Patents
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Abstract
本发明涉及燃料电池技术领域,尤其涉及一种分子膜碳纸及其制备方法和应用。本发明提供了一种分子膜碳纸的制备方法,包括以下步骤:将高分子膜在酸液中进行浸渍处理后,热处理,得到预处理后的高分子膜;所述高分子膜的材料为导电聚合物;采用等离子气相化学沉积的方式,以乙炔为工作气,在所述预处理后的高分子膜表面沉积碳,得到所述分子膜碳纸。利用所述制备方法制备得到的分子膜碳纸同时具有较好的机械强度、疏水性和电导率。
Description
技术领域
本发明涉及燃料电池技术领域,尤其涉及一种分子膜碳纸及其制备方法和应用。
背景技术
燃料电池是一种将存在于燃料与氧化剂中的化学能直接转化为电能的发电装置。它直接将燃料的化学能转化为电能,中间不经过燃烧过程,因而不受卡诺循环的限制,具有能量转化效率高的特点。
气体扩散层是质子交换膜燃料电池的重要组件,可以将燃料电池反应生成的水及时排出,也可起到气体扩散和支撑催化层的作用。因此气体扩散层结构需保证高机械强度的同时,还要具有良好的气体透过性和排水性。目前气体扩散层主要以碳纤维纸为基础材料,但碳纸原纸中胶黏剂经高温碳化后大量挥发仅残存少量碳物质,强度几乎丧失。目前的制作工艺是采用含碳量高的树脂浸渍碳纸原纸,经高温处理,树脂碳化后残留的碳对碳纤维起到粘结和增强作用,从而保持碳纸的形状和强度。然而目前碳纸的浸渍工艺制备的气体扩散层仍存在透气疏水性和电子传导能力不能兼具的缺点,而且其制备工艺繁琐且价格较高,不能较好的满足要求。为了更好地提高其性能,许多研究人员从气体扩散层的浸渍原料、结构和工艺方面开始入手进行改进优化,通过超声浸渍方法在碳纤维纸表面浸渍树脂石墨烯和稳定增强添加料混合溶液,并采用两次碳化来提高其透气性和碳含量,制备柔韧性、力学性能和透气性等较好的气体扩散层,但其疏水性较差。
发明内容
本发明的目的在于提供一种分子膜碳纸及其制备方法和应用,利用所述制备方法制备得到的分子膜碳纸同时具有较好的机械强度、疏水性和电导率。
为了实现上述发明目的,本发明提供以下技术方案:
本发明提供了一种分子膜碳纸的制备方法,包括以下步骤:
将高分子膜在酸液中进行浸渍处理后,热处理,得到预处理后的高分子膜;所述高分子膜的材料为导电聚合物;
采用等离子气相化学沉积的方式,以乙炔为工作气,在所述预处理后的高分子膜表面沉积碳,得到所述分子膜碳纸。
优选的,所述高分子膜的材料包括聚乙烯、聚苯胺、聚吡咯、聚噻吩或聚苯乙炔。
优选的,所述酸液的质量浓度为20%~40%,所述酸液的温度为30~50℃。
优选的,所述酸液为盐酸、硝酸和硫酸中的一种或几种。
优选的,所述浸渍处理后还包括清洗;
所述清洗采用的清洗剂为水;所述热处理的温度为600~800℃,时间为3~4h。
优选的,所述等离子气相化学沉积的气氛为乙炔和惰性气体的混合气;
所述混合气中的乙炔的体积百分比为25%~75%。
优选的,所述惰性气体为氮气、氩气和氦气中的一种或几种。
优选的,所述等离子气相化学沉积的温度为400~800℃,时间为30~120min。
本发明还提供了上述技术方案所述制备方法制备得到的分子膜碳纸。
本发明还提供了上述技术方案所述分子膜碳纸在燃料电池气体扩散层中的应用。
本发明提供了一种分子膜碳纸的制备方法,包括以下步骤:将高分子膜在酸液中进行浸渍处理后,热处理,得到预处理后的高分子膜;所述高分子膜的材料为导电聚合物;采用等离子气相化学沉积的方式,以乙炔为工作气,在所述预处理后的高分子膜表面沉积碳,得到所述分子膜碳纸。本发明在制备过程中不需要使用胶黏剂和树脂,从根本上解决了高温下胶黏剂挥发的问题。本发明以高分子膜为基底,显著提高了分子膜碳纸的机械强度及疏水性;然后通过气相化学沉积法在所述高分子膜表面沉积碳,在沉积过程中碳原子完成了碳化和石墨化过程,碳在膜的孔径内形成传导电子的通道,提高了碳纸的电导率。通过该方法制备的碳纸同时具备较高的机械强度、良好的疏水性和电导率。所述气相化学沉积法工艺简单,不涉及到粘结剂,从原理上解决了碳纸机械强度低的问题。
与现有技术相比,本发明所述制备方法具有以下优势:
1)本发明采用高分子膜基底材料作为共轭性聚合物经过掺杂后,电导率可达到半导体甚至是金属导体水平;其中表面的疏水官能团极大的提高了燃料电池气体扩散层的疏水和排水能力;
2)本发明采用气相化学沉积法将碳沉积在高分子膜基底上,真空下辉光放电,乙炔分子键断裂在电场作用下碳沉积在高分子膜基底上。碳原子在膜的孔径内形成传导电子的通道,提高了分子膜碳纸的电导率;
3)所述方法工艺步骤简单,适用于大规模生产,制备得到的分子膜碳纸具有高电子传导能力,兼具较好的疏水性,能够有效提高燃料电池的效率。
具体实施方式
本发明提供了一种分子膜碳纸的制备方法,包括以下步骤:
将高分子膜在酸液中进行浸渍处理后,热处理,得到预处理后的高分子膜;
采用等离子气相化学沉积的方式,以乙炔为工作气,在所述预处理后的高分子膜表面沉积碳,得到所述分子膜碳纸。
在本发明中,若无特殊说明,所有制备原料均为本领域技术人员熟知的市售产品。
本发明将高分子膜在酸液中进行浸渍处理后,热处理,得到预处理后的高分子膜。
在本发明中,所述高分子膜的材料包括导电聚合物,优选包括聚乙烯、聚苯胺、聚吡咯、聚噻吩或聚苯乙炔。在本发明中,所述导电聚合物具有共轭双键,所述共轭双键的存在使得导电聚合物具有一维半导体的不稳定性,在掺杂改性后从绝缘状态跃迁到半导体或导体的状态。
在本发明中,所述酸液的质量浓度优选为20%~40%,更优选为25%~35%,最优选为28%~32%;所述酸液优选为盐酸、硝酸和硫酸中的一种或几种;当所述酸液为上述具体选择中的两种以上时,本发明对上述具体物质的配比没有任何特殊的限定,按任意配比进行混合即可。所述酸液的温度优选为30~50℃,更优选为35~45℃,最优选为38~42℃;所述浸渍处理的时间优选为4~5h。在本发明中,所述浸渍优选为将所述高分子膜浸没在酸液中。
在本发明中,所述浸渍处理后还优选包括清洗,所述清洗采用的清洗剂优选为水。
在本发明中,高分子膜本身的疏水官能团有利于增强气体扩散层的疏水和排水能力,所述浸渍处理的目的是洗去高分子膜表面上的杂质。
在本发明中,所述热处理的温度优选为600~800℃,更优选为650~750℃,最优选为780~820℃;时间优选为3~4h。
在本发明中,所述热处理的目的是去除热处理将高分子膜中的水分。
得到预处理后的高分子膜后,本发明采用等离子气相化学沉积的方式,以乙炔为工作气,在所述预处理后的高分子膜表面沉积碳,得到所述分子膜碳纸。
在本发明中,所述气相化学沉积的气氛优选为乙炔和惰性气体的混合气;所述混合气中的乙炔的体积百分比优选为25%~75%,更优选为30%~60%,最优选为40%~50%。在本发明中,所述惰性气体优选为氮气、氩气和氦气中的一种或几种;当所述惰性气体为上述具体选择中的两种以上时,本发明对上述气体的配比没有任何特殊的限定,按任意配比进行混合即可。
在本发明中,所述等离子气相化学沉积的温度优选为400~800℃,更优选为450~750℃,最优选为500~600℃;时间优选为30~120min,更优选为50~100min,最优选为60~80min。
在本发明中,所述等离子气相化学沉积优选在辉光放电的条件下进行,所述辉光放电优选在0~10Pa的条件下进行,所述辉光放电的功率优选为100~150W。
本发明还提供了上述技术方案所述制备方法制备得到的分子膜碳纸。
本发明还提供了上述技术方案所述分子膜碳纸在燃料电池气体扩散层中的应用。本发明对所述应用的方法没有任何特殊的限定,采用本领域技术人员熟知的方法进行即可。
下面结合实施例对本发明提供的分子膜碳纸及其制备方法和应用进行详细的说明,但是不能把它们理解为对本发明保护范围的限定。
实施例1
将聚乙烯分子膜浸没在质量浓度为30%,温度为40℃的稀硝酸溶液中浸渍5h后,用大量的去离子水冲洗,600℃热处理3h,得到预处理后的高分子膜;
将所述预处理后的高分子膜放入气相化学沉积装置反应舱中,通入乙炔和惰性气体的混合气(惰性气体为氩气,乙炔的体积百分比为50%)至-0.02MPa,施加辉光放电(100W),进行等离子气相化学沉积,所述等离子气相化学沉积的温度为600℃,时间为90min,得到所述分子膜碳纸。
实施例2
将聚苯胺分子膜浸没在质量浓度为40%,温度为50℃的稀硫酸溶液中浸渍4h后,用大量的去离子水冲洗,700℃热处理4h,得到预处理后的高分子膜;
将所述预处理后的高分子膜放入气相化学沉积装置反应舱中,通入乙炔和惰性气体的混合气(惰性气体为氮气,乙炔的体积百分比为40%)至-0.04MPa,施加辉光放电(150W),进行等离子气相化学沉积,所述等离子气相化学沉积的温度为500℃,时间为60min,得到所述分子膜碳纸。
实施例3
将聚吡咯分子膜浸没在质量浓度为40%,温度为40℃的稀盐酸溶液中浸渍4h后,用大量的去离子水冲洗,600℃热处理4h,得到预处理后的高分子膜;
将所述预处理后的高分子膜放入气相化学沉积装置反应舱中,通入乙炔和惰性气体的混合气(惰性气体为氩气,乙炔的体积百分比为60%)至-0.05MPa,施加辉光放电(100w),进行等离子气相化学沉积,所述等离子气相化学沉积的温度为600℃,时间为120min,得到所述分子膜碳纸。
对比例1
制备方法与实施例1不同,具体制备过程为:采用真空浸渍的方法,将碳纤维纸在混合溶液中(所述混合溶液的溶质为酚醛树脂和聚酰亚胺,溶剂为甲醇溶剂,质量浓度为10%)进行浸渍(所述浸渍的条件为40℃,12h)后,固化(所述固化的条件为300℃,3h)、碳化(所述碳化的条件为800℃,1h)和石墨化(所述石墨化的条件为2000℃,1h),得到燃料电池气体扩散层。
对比例2
将聚乙烯分子膜浸没在质量浓度为30%,温度为40℃的稀硝酸溶液中浸渍5h后,用大量的去离子水冲洗,600℃热处理3h,得到预处理后的高分子膜;
在所述预处理后的高分子膜的表面喷涂碳粉(喷涂碳粉的条件为施加压力为15MPa,喷涂时间为15min,喷嘴口径为19mm,枪口与碳纸距离为0.2m)后,固化(所述固化的条件为350℃,2h)、碳化(所述碳化的条件为850℃,2h)和石墨化(所述石墨化的条件为2000℃,2h),得到燃料电池气体扩散层。
测试例
对实施例1~3所述分子膜碳纸和对比例1~2所述燃料电池气体扩散层进行性能测试,测试结果如表1所示:
表1实施例1~3所述分子膜碳纸和对比例1~2所述燃料电池气体扩散层的性能参数
由表1可知,本发明制备得到的分子膜碳纸具有较高透气率的同时具有较高的导电率,还兼具较好的疏水性和拉伸强度,此工艺展现出较好的应用前景。
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (10)
1.一种分子膜碳纸的制备方法,其特征在于,包括以下步骤:
将高分子膜在酸液中进行浸渍处理后,热处理,得到预处理后的高分子膜;所述高分子膜的材料为导电聚合物;
采用等离子气相化学沉积的方式,以乙炔为工作气,在所述预处理后的高分子膜表面沉积碳,得到所述分子膜碳纸。
2.如权利要求1所述的制备方法,其特征在于,所述高分子膜的材料包括聚乙烯、聚苯胺、聚吡咯、聚噻吩或聚苯乙炔。
3.如权利要求1所述的制备方法,其特征在于,所述酸液的质量浓度为20%~40%,所述酸液的温度为30~50℃。
4.如权利要求1或3所述的制备方法,其特征在于,所述酸液为盐酸、硝酸和硫酸中的一种或几种。
5.如权利要求1所述的制备方法,其特征在于,所述浸渍处理后还包括清洗;
所述清洗采用的清洗剂为水;所述热处理的温度为600~800℃,时间为3~4h。
6.如权利要求1所述的制备方法,其特征在于,所述等离子气相化学沉积的气氛为乙炔和惰性气体的混合气;
所述混合气中的乙炔的体积百分比为25%~75%。
7.如权利要求6所述的制备方法,其特征在于,所述惰性气体为氮气、氩气和氦气中的一种或几种。
8.如权利要求1、6或7所述的制备方法,其特征在于,所述等离子气相化学沉积的温度为400~800℃,时间为30~120min。
9.权利要求1~8任一项所述制备方法制备得到的分子膜碳纸。
10.权利要求9所述分子膜碳纸在燃料电池气体扩散层中的应用。
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